See also References Notes Bibliography Bowers, Pete M. The Gee Bee Racers. Leatherhead, Surrey, UK: Profile Publications Ltd., 1965. Donald, David, ed. The Complete Encyclopedia of World Aircraft. London: Orbis, 1997. . External links Granville Brothers aircraft 1930s United States sport aircraft Single-engined tractor aircraft Low-wing aircraft Racing aircraft Aircraft first flown in 1931